D. MILNE HOME ON THE PARALLEL ROADS OF LOCHABER. 613 
When the sides of the hills are examined, on both sides of the valley where this 
lower shelf terminates, abundance of detrital matter is still traceable. <At 
Teindrish, which is on the north side, there are great cliffs of tenacious clay, 
full of boulders, reaching to a height of at least 1000 feet above the sea. 
Similar deposits, and at as high a level, exist on the south side of the valley, 
viz., at Corry Choilzie and Corry N’Eoin. 
But there are other conditions which suggest even a higher and more 
extensive blockage in this quarter. The Glen Gluoy shelves imply a blockage 
reaching to a height of 1170 feet above the sea. How long did this Gluoy lake 
continue even at its lower shelf, which is about 970 feet above the sea? Glen 
Gluoy opens its mouth on the Great Glen ; and the highest shelf in it reaches 
to a pot within a mile of Loch Lochey. The probability therefore is, that if 


B Wrst. 
i mee iG ee KCC 
Ground plan to show the position of the Kilfinnin shelf, first discovered by My Darwin. 
Bis the valley to which Mr Darwin supposed the shelf to be confined, terminating at the 
summit of the valley a. But the shelf passes eastward into the adjoining valley called Glen 
Buck, marked A. 

detritus blocked the Glen Gluoy Lake, this detritus formed part of an 
accumulation which filled the Great Glen in this part of its course. 
_ Then there is the shelf at the place called by Mr Darwmy, Kiljinnin, at a 
height of about 1300 feet above the sea. ‘Mr Darwin states that, having 
observed this shelf from many points of view, he is prepared positively to assert 
that it is in every respect as characteristic as any in Glen Roy; and that its 
origin must be as carefully attended to in any general theory of the formation 
of the shelves” (p. 45). In company with the Rev. Mr Cameron, who is pro- 
bably more than any one familiar with the character of the Glen Roy Parallel 
Roads, I twice examined this Kilfinnin shelf. It is in a high valley on the south 
side of the Caledonian Canal, opposite to Invergarry. The valley is called 
Laggan, and is roughly represented in fig. 11. It runs parallel with the Great 
Valley. The shelf is visible on both sides of Laggan Valley. But it does not 
terminate with the head of that valley at a, as Mr Darwin seems, from his brief 
description of it, to have supposed. The shelf passes over the summit level or 
col which divides Laggan Valley from the valley to the east called Glen Buck, 
as Shown in the diagram. 
